Are my Sea Cucumbers mating?

[jmait769]

I got these two with my TBS rock and for the most part have rarely seen them. But for the last few days they have been inseparable! They lay side by side (out in the open of all things!), follow each other around and seem to push against each other. I have no experience or knowledge about these guys so any input would be helpful! I was told they are Donkey Dung cucumbers? Well, here are the pictures!

http://i112.photobucket.com/albums/n172/jmait769/SeaCucumbers01.jpg

http://i112.photobucket.com/albums/n172/jmait769/zooks05.jpg

http://i112.photobucket.com/albums/n172/jmait769/SeaCucumbers02.jpg

Jay